.cate{
    height: 100%;
    main{
        display: flex;
        padding-right: 10px;
        height: 507px;
        .leftnav{
            width: 90px;
            .item{
                line-height: 40px;
                padding-left: 20px;
            }
            .item.stair{
                background-color: #eee;
                color: crimson;
            }
        }
        .rightlist{
            flex: 1;
            height: 100%;
            overflow-y: auto;
            .sceond{
                h2{
                    font-weight: 700;
                    font-size: 20px;
                    line-height: 50px;
                }
                .sceondlist{
                    display: flex;
                    flex-wrap: wrap;
                    .three{
                        width: 33%;
                        text-align: center;
                        margin-bottom: 10px;
                        img{
                            width: 70%;
                        }
                    }
                }
            }
        }
    }
}